It is important for your dog to be secured while riding in the car. He can be a distraction to you and become a dangerous projectile in the event of an accident. There are many ways that you can secure your dog, including dog car seats, harnesses, and kennels like this one from Pet Ego.
The unique design of this kennel is shaped like a tube, hence the name Pet Tube, and fits in the backseat of any vehicle. It can be extended fully, 3/4 of the way extended, or only extended 1/2 of the way. It also zips flat for easy carrying and storage.
There are three safety belts attached to the pet tube to make sure that it is securely strapped into the vehicle and your pet will be as safe as possible. This expandable tube is great for traveling and can hold multiple dogs.